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To use the glossary, simply click on the first letter of
the term of interest below:
F
- FCC (Federal Communications Commission)
- A US body regulating, approving and licensing radiated
electromagnetic signals including broadcasting and telecommunications.
- FDDI
- Fiber Distributed Data Interface. A North American
100-Mbps, reliable dual-ring voice and data building distribution system.
- FDM
- Frequency Division Multiplex.
- FDMA
- Frequency-Division, Multiple Access.
- FEC
- Forward Error Correction, (which see).
- Field Subsampling
- See Spatial Filtering.
- Firmware
- Data and/or program software for an electronic device stored
in a non-volatile form using a semiconductor memory circuit.
- Flash Memory
- A fast, reliable variant of EEPROM or Electrically-Erasable Programmable Read-Only Memory, a non-volatile, electrically alterable form of semiconductor storage present in some telecommunications equipment for long-term storage of configuration, dialing and related information.
- FM
- Frequency Modulation
- Forced Intraframe Coding
- 1. In motion video compression, immediately following a
significant scene change, the differential, predictive and inter- frame coding
aspects are temporarily disabled. Then, information is transmitted for the
first changed frame, derived entirely from within that frame.
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- 2. In motion video compression, the technique where static
parts of the image are periodically refreshed to mitigate the effects of error
build-up in the system.
- Forward Error Correction
- Forward error correction provides correction of data in error for applications where a return signal path is unavailable or system latency is excessive to permit retransmission of the data. It is used for CDs, videoconferencing and DBS, for example.
FEC uses a mathematical technique in which a syndrome is
generated and transmitted with the data. At the receive location, processing of the
syndrome along with the data, allows correction of errors caused by the transmission system. Depending upon the specific FEC technique used, and how it is applied, transmitted signals can be made more robust in the presence of transmission errors.
- FOTS
- Fiber Optic Transmission System. With its minimal transit
time delay and very low bit error rate, FOTS is the superior method to transmit
high-speed data, digital video signals and other compressed signals.
- fps
- Frames (usually motion video frames) per second.
- Frame Delete Compression
- In H.261 and H.263 motion video compression, the act of
totally discarding from zero to three consecutive video frames is part of the
video compression process. Its use depends upon the degree of video motion
existing and the aggregate bit rate. Because of the large data loss with this
technique, this is truly a compression approach of last resort.
- Frame Relay
- A wide-area network protocol often transported over DS1
facilities. Latency can cause problems for videoconferencing.
- Front Porch
- Television usage: In a composite video signal, that portion of
the signal between the end of the active video on each horizontal scanning line
and the leading edge of the horizontal synchronization pulse.
- FSK
- Frequency Shift Keying, a data transmission
modulation method.
- FSS
- Fixed Satellite Service; satellite service to a
fixed, non-mobile, location.
- Full Duplex
- A transmission system, together with its associated
equipment, capable of simultaneously transmitting and receiving signals, as
opposed to simplex (unidirectional) or half-duplex (one direction
at a time) systems.
To use the glossary, click on the first letter of
the term of interest:
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© 2006 - 2008 Acleris
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